Which of the following is true about pure substances? A.
A pure substance has the same chemical properties throughout.
B.
All pure substances are unable to be separated by any means.
C.
A pure substance can only be made up of one kind of atom.
D.
A pure substance can always be separated by physical means.

pretty sure its B

Explanation:

Mitosis is asexual reproduction and only requires one parent, so it produces two identical diploid cells. these cells are somatic cells, or body cells, so they're going to be identical  to the original cells (diploid cells = the same number of chromosomes as the original). meiosis, on the other hand, is sexual reproduction and requires two parents. these cells are gametic cells (sperm and eggs) so they're going to produce genetically different cells. since meiosis occurs twice (meiosis 1 and meiosis 2), it's going to result in four haploid cells (half the number of chromosomes). hope this ! : )